The efficient motion estimation algorithms are the important research hotspot in the real time-video coding-decoding technology.The prediction error can be decreased by incorporating high accuracy estimation and compensation

and the performance of compressed video can be improved.The high computational demands of the H.264 video encoder are reduced by an deformable block-matching algorithm using the node-based model.This algorithm well exploits the motion vector statistic characteristic and correlation and uses motion estimation criterion based on the pixel difference classify.Experiments show that the efficient motion estimation algorithm proposed can further reduce block matching distortion computations relative to conventional fast motion estimation algorithms with neglectable coding efficiency loss.